Rolls-Royce Silver Shadow
B
Bentley
T
Series
Workshop
Manual
Chapter
K
Section
K7
FAULT
DIAGNOSIS
ACTION
1 (a) Disconnect the
fuel
line at the
carburetters, switch on the igni-
tion and check for fuel flow.
If
there is a good flow of fuel,
carry out checks
1
(c) and 9 (a).
If there is no fuel flow connect
the carburetter feed pipe and
disconnect the flexible
pjpe from
the pressure side of the pump.
If there is no fuel flow,
carry
out check
I
(d).
(b) Refer to Symptom 9-Action
9 (a).
(c) Disconnect the sarburetter fuel
feed pipes, then unscrew the
float chamber lid unions; if
necessary, remove and clean the
filters. Reconnect the pipes.
(d)
Connect a
12
volt bulb between
the electrical supply and the
pump body.
If
the bulb fails to
light, examine the earthing of
the pump and the supply lead
from the main ignition fuse.
(e)
Ensure that the electrical supply
is satisfactory
(see
1
(d)).
Remove the bakelite cover and
ensure that the tungsten points
are in contact.
Clean
the points
by drawing a piece of fine glass
paper across them whilst they
are held together.
Check their operation by placing
the supply lead onto the ter-
minal and a
shol t piece of bared
wire put across the contacts. If
the pump operates for one stroke
the fault is due to dirt, corrosion
or mal-adjustment of the contact
points.
SYMPTOM
iQA
pumps
1.
Fuel pump fails to operate.
POSSIBLE
CAUSE
1.
(a) Faulty fuel pumps.
(b)
Faulty or obstructed float cham-
ber needle valves.
(c) Blocked
carburetter filters.
(d) Faulty electrical circuit.
(e)
Dirty
or incorrectly set contact
points.
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